u/averagetrailertrash

I'm working on a submission and am unsure which demographic I should categorize it under, as they're describing seinen as a unisex standard for all adult readers... but then have josei as a separate option.

So I'm wondering where you guys feel the line is between the two?

Is there some inherently "girls only" element I need to look out for that would make a story inappropriate for seinen audiences? Or is it mostly about the art style and paneling choices? Or something else altogether?